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Si Wenyan common

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package com.github.siwenyan.common;

public class StringUtils {

    public static boolean isEmpty(String s) {
        return null == s || s.trim().isEmpty() || s.trim().matches("-*");
    }

    public static String peel(String raw) {
        if (null == raw) {
            return null;
        }
        raw = raw.trim();
        while (raw.length() > 1 && isWrapped(raw)) {

            raw = raw.substring(1, raw.length() - 1);
        }

        return raw;
    }

    private static boolean isWrapped(String raw) {
        for (String[] pair : PEEL_PAIRS) {
            if (raw.startsWith(pair[0]) && raw.endsWith(pair[1])
                    && (raw.indexOf(pair[0], 1) < 0 || raw.length() - 1 == raw.indexOf(pair[0], 1))
                    && (raw.indexOf(pair[1], 1) < 0 || raw.length() - 1 == raw.indexOf(pair[1], 1))
            ) {
                return true;
            }
        }
        return false;
    }

    private static final String[][] PEEL_PAIRS = {{"{", "}"}, {"[", "]"}, {"(", ")"}, {"\"", "\""},
            {"'", "'"}};

}